A temperature sensor and method of forming the same includes a temperature sensing portion having a metal housing configured with at least one circular fin on a surface of the metal housing. A temperature sensing element is generally associated with the temperature sensing portion, wherein a potting is located within a gap formed between the temperature sensing element and the metal housing and joined with a ceramic tube for carrying a plurality of high temperature metal lead wires to and from the temperature sensing portion, thereby forming a temperature sensor utilized in an exhaust gas environment to measure temperature and improve a response time and accuracy of the temperature sensor due to an increase in surface area of the sensor tip for a given thermal mass for convection heat transfer.